Lens-cutting machine



as seen from` below;

Patented Aug. 9, 1927.v

irs srares intacta sereni erica.

WILLI sCHLrEE, orv BRUNSWICK, GERMANY, AssICNoR Iro THE EIRM GEIMME, NATALIS U. Co. AKTIENGESELLSCHAFT, or KASTANIENALLE, 71, BRAUNSCHWEIG,

GERMANY.

' LENS-Cummins MACHINE.

Application iled` September 2 0, 1926, Serial No. 136,699, and in Germany May 14, 1924.

My invention .relates to an improvement ina spectacle glass cutting machine for the cutting of round, oval or elliptical and socalled pantoscopic spectacle glasses.

The new .machine according to my invenn tion is characterized by a satisfactory supporting and guidance ofthe driving shaft for the'cutting'diamond, .A further ladvantage of my invention consists in the fact that the adjustment of the driving shaft intoa concentric or an eccen- .tric vposition is effected by simple and reliably vact-ing means.

A further advantage of'my invention is to be seen in the fact that the adjustment of the radiusof the roundglass and the adjustinentfofthe semi major axis of the ellipticaly oroval glass; is effected without employ-` ing a. screw-thread. f v f Y VThe .accompanying drawings show one eonstructional example of my rinvention Fig.l lfshows the vnew machine. in partial sectional elevation;y Fig. 2 shows a plan of Vthe driving members with lthe. driving shaft in an eccentric position; l

Fig. S'shows the-.saine parts' as Figf2, but

in a `concentric other; l

Fig. 4 shows -diagrammatically how an elliptical path ifs described by the cutting diamond when'thedriving members are adjustedin accordance with Fig. 2;

position relative to one an- Fig. 5ysliows-diagrammatically how thel cutting diamond describes a. circular path with the adjustment. of the parts in accord ancewith Fig.3; f

Fig. y-6 shows the adjusting apparatus by means of which the driving shaft is brought intofa concentric or an eccentric position,

Fig. 7 shows the saine adjusting paratus, as seen from above. i Figf8 shows the adjusting, apparatu'sfor the diameter-ofthe glass vto Vbe cut, partly in section, from theifront; 'f Fig. 9 shows the same apparatus in front elevation;V

.Fig. 10 is a plan of Fig. 8.

For theipositioning .of the spectacle glass 1 there serves a table 2, ywhich is provided with an..indiarubberplate 2 yor the like and 'which forms part of a machine frame 8.

To one side of the table 2-isfiXedly arranged,

.Lon theV part 8, a column4 upony which, by

round the column 4. By

cutting diamond 25. This driving shaft 8 is.

akiallydisplaceable in a sleeve 9 and is provided at its lower end with an axial borein f which is located a spring 10.which acts upon a pin 11. Y On the lower end of the pin 11 is arranged a support 12 which firmly holds the spectacle glass 1 and which is spherically supported at both ends in orderthat its foot 18, when'placed upon the `spectacle glass, may remain immovable when the shaft 11 moves radially. .The'shaft 8 is provided witha hand-crank 14, and the sleeve 9 is providedwitha crank 1 5, which is driven bythe crank 14 by means of apin 16 which slides in a sleeve 17 on'the crank 15 as the shaft 8 slides downwards. On a collar 18, with which the sleeve`9 bears upon the bearing' 7, islocated a circular disc 19 which is slidabl'e, with-an elongated h'ole'20, upon the .sleeve 9, radially to the shaft 8.y The disc 19fpossesses a transverse groove or re- Vcess 21 by which it is slidably associated with the crank 15 and is driven by. this crank as the driving shaft 8 rotates. The disc 19 rolls between two prongs 22 and 23rof aV the shaft 8 (Fig. 2), and the latter moves 'to and fro as it-rotates in the direction of the arrow 3/ in Fig. 4.- This takes place because the disc 19 rolling between the fixed prongs 22 and 28 swings the cantilever 6 this swinging movement the glasscutter 25, as shown in Fig.` 4, moves upon a substantially` elliptical.curve, that is to say, a substantially ellipticalv glass isvcut.

yThe apparatus by which the disc 19 is shifted into the concentric and eccentric position relative to the shaft 8 can be seen from Figs. 1, 6 and 7.. A small hand-wheel 26 rotatable upont-he sleeve 9 is provided-witha Q. i 1 f 1,638,063

Y hub 27 displaces the ring in such a way that fil) its bore 29 niovesthe pin 3() and consequently the discv 19y radially in relation to the driving shaft 8. According tothe direction of this movement, the disc 19 passes either into an eccentric position4 (Fig. 2) or into a concentric position (Fig. alrelative to the shaft-8. The extent of this displacementcan be read off on a scale 3l, which is .engraved on the liandplate 26 and which moves past a mark 46, which is secured to the crank-v arm 15 of the sleeve 9, (Fig. 7). By means ofa nut 42 adapted tobc screwed upon .ther upper end of the sleeve 9', the parts can be clamped in the/adjusted posit-ioni For the adjustment of the diameter of the glass and of the major axis of ellipse there rserves an eccentric disc 32, as shown iii-Figs. 8 to l0. This is surrounded by a ring 33 which with .parallel surfaces guildes the disc 32 in a bedy This bed 34 forms a part of the support 35 fixed to. the lower end of the d'rivingsliaft 8, for the. cutting diamond. 25. They pivot ofthe disc 32 is fcrmed by an axle 36 which, forms, with a; slide 37, a Tshaped piece (Fig. 10). To the slide 37 is-secur'ed the clamping device 38 for the cutting diamond 25. As the disc 32 rotates, this axle, andy with it the slideJ 37', is shifted to right or 'left in consequence of the` eccen- .triclty ofthe said disc in relation tol itsl axle 36; By this means the distance of the cutting diamond `25 from the axis of rota-v tion of the shaft S is altered.V

For the rotating of the disc 32 there serves a; sector 39, to which the disc 32, as shown in Fig. 10, forms a hub. The sector 39 is provided with a graduated scale which travels past a`V pointer 40; which, with its disc 4l, is slipped on to the a'XleBl. Inporder that this pointer 40 may not participate in the rotation of the sector 39, its disc 41 engages in' a notch 45 inthe axle 36. The div nien'sion of the displacementof the cutting diamond 25 can be readl off on this scale. By means of a nut 43 which screws on to the front end of the aXle'BtS, the parts are clamped in the adjusted position.

that is 'claimed is A y l. A spectacle glass cutting machine, comprising a stationary column, a cantilever swingably supported onv said column, a glass cutter, a: straight shaft carrying said glass .cutter and rotatably Vand longitudinally slidably supported in said cantilever, means for iinpartingv t'o said shaft andV cantilever a 'positive swinging. movement as the shaft This pin 30 is secured tothe. disck is rotated including means for adjusting the amplitude of said movement, said meansy 1.

coniprising'a. transversely adjustable eccentric carii'ied by .said shaft. and rotatable therewith anda n'ieinber havinfrsnaccd stai c: .l

tionary surfaces tangential to and bearing `:it opposed parts against the pefriplieryof said eccentric andbetween which the eccenl, i

Q. A spectacle glass cutting machine, coma stationaryk column, a' cantilever ily supported on said column. said cantil'e er consisting of twol parallel sleeves-- rig Vly connected with' one another, one of said sleeves litting over said column to enable said cantilever to swing around said column, a glass cutter, a shaft carrying theglas's "cutter and rotatably and slidably supported inthe second sleeve of said cantilever, means for impartingto said shaftand cantilever' a positive swinging'movement asthe 'shaft is'rotated including means for adjusting theV amplitude of said movement, said' means comprising a transversely ladjustable eccentric carried by said shaft and rotatable therewith, and a meinberhavingspaced staL tionary surfaces tangential toand bearing atV opposed parts against the periphery ofsaid eccentric and between which? theeccentric cutter, `a driving shaft j'ournalled vertically in said cantilever and arranged parallelto said col'umnand carrying saidfglass cutter an adjustable str-olie device` for the driving shaft including al part transversely adjust able on and-1 with the shaft, and forked arm fixedly connected with said column with the prongs arranged' on opposite sides of and in contact with thep'artfo'n the shaft',

substantially 'as and for the purposes set forth. i p. Y

4s. A spectacle` glasscutting machine, comprising a column, a cantilever swing'able on said column and forming a bearing, a driving shaft mounted forjrotatzilole` andvertical` sliding movement inthe bearingon the can'-y tilever and arranged parallelrtothe column, a Adisc radial-ly displaceablek in relation to said driving shaft, an arm carried with the drivin-g shaft, the disc being-adapted to slide on said atan, guides arra'ngedon oppo site sides of the disc fonfcontact therewith and `tixedly connected to `said column, the disc being rotatable with the drivingshaft between said guides', another disc vrotatable on 'the shaft, and means interposed between the discs for shifting the radially displaceable disc upon rotation` `of they last=namedI Vsubstantially as and forthe purposes set forth.

5. Aspectacle glass cutting machine, comprsing a column, a cantilever swingable on said columnand forming a bearing, a driving shaft mounted for rotatable and slid' ablemovement in the bearing and said can- ,y

tilever` arranged parallel to the column, an

eccentric disc radially displaceabley with re`Y spectto said driving shai't, an arm iXedly connected With the'` driving shaft, the disc being adapted-V to Vslide along said arm, spaced stationary lguides Jfor said disc7 the disc being rotatablel with the driving shaft and. positioned between said guides, van adjustable disc rotatable on the shaft, a cam on said adjustable disc, a ring embracing said 'cam and provided with a cavity, and apin on the eccentric disc engaging inthe cavity mg means is mounted on the sleeve for coactving with the collar for clamping the adjusting and eccentric discs together in the `desired relative positions, substantially as and for the purposes set forth.

In testimony whereof I have signed my name to this specification.

WILLI SGHLTER. 

